Yuav ua li cas hloov dual fais fab mov Circuit Court rau ib lub hwj chim mov Circuit Court
1.1 Fais fab mov thiab ib lub hwj chim mov
Txhua lub tshuab ua haujlwm muaj ob lub zog pins, feem ntau sau tias VCC + thiab VCC - hauv cov ntaub ntawv, tab sis qee zaum lawv cov ntawv yog VCC + thiab GND. Qhov no yog vim qee tus kws sau ntawv ntawm cov ntaub ntawv phau ntawv sim ua kom qhov sib txawv ntawm qhov sib txawv ntawm ib lub zog ua haujlwm amplifiers thiab dual lub zog ua haujlwm amplifiers. Txawm li cas los xij, qhov no tsis txhais hais tias lawv yuav tsum siv li ntawd - lawv tuaj yeem ua haujlwm ntawm lwm qhov hluav taws xob. Thaum lub lag luam amplifier tsis siv los ntawm lub neej ntawd voltage, nws yog ib qho tsim nyog yuav tsum tau xa mus rau lub chaw ua haujlwm amplifier cov ntaub ntawv phau ntawv, tshwj xeeb tshaj yog cov lus qhia siab tshaj plaws voltage thiab voltage viav vias cov lus qhia.
Feem ntau ntawm analog circuit designers paub yuav ua li cas siv amplifiers ua hauj lwm nyob rau hauv dual hwj chim mov voltage tej yam kev mob, xws li Circuit Court nyob rau sab laug ntawm daim duab 1, qhov twg ib tug dual fais fab mov muaj ib tug zoo zog mov thiab ib tug sib npaug voltage tsis zoo fais fab mov. Feem ntau, nws yog qhov zoo lossis tsis zoo 15V, qhov zoo lossis qhov tsis zoo 12V, thiab qhov zoo lossis tsis zoo 5V, uas feem ntau siv. Lub input voltage thiab output voltage yog ob qho tib si muab los ntawm qhov siv hauv av, nrog rau qhov siab tshaj plaws viav vias amplitude Vom ntawm qhov zoo thiab qhov tsis zoo voltages thiab qhov siab tshaj plaws qhov tawm viav vias amplitude.
Lub hwj chim tus pin ntawm kev ua haujlwm amplifier nyob rau hauv ib qho hluav taws xob muab hluav taws xob txuas nrog lub zog zoo thiab hauv av. Txuas tus pin zoo rau VCC +, lossis txuas hauv av lossis VCC - tus pin rau GND. Faib qhov hluav taws xob zoo rau hauv ib nrab thiab txuas nws raws li hauv av virtual rau tus pin input ntawm lub tshuab ua haujlwm. Lub sijhawm no, qhov tso zis hluav taws xob ntawm kev ua haujlwm amplifier kuj yog qhov hluav taws xob hauv av virtual. Cov zis hluav taws xob ntawm lub tshuab ua haujlwm ua haujlwm yog nyob ib puag ncig hauv av virtual thiab lub amplitude yog nyob rau hauv Vom. Qee qhov kev ua haujlwm tshiab amplifiers muaj ob qhov sib txawv ntau qhov tso zis voltages thiab qhov tso zis tsawg kawg nkaus. Cov ntaub ntawv phau ntawv rau hom kev ua haujlwm amplifier yuav qhia tshwj xeeb Voh thiab Vol. Nws yuav tsum raug sau tseg tias ntau tus neeg tsim qauv siv lub hauv paus virtual los xa mus rau cov tswv yim thiab cov zis voltages. Txawm li cas los xij, nyob rau hauv ntau daim ntawv thov, cov tswv yim thiab cov zis yog raws li qhov siv hluav taws xob siv hauv av, yog li cov neeg tsim qauv yuav tsum ntxiv DC cais capacitors ntawm cov tswv yim thiab cov ntsiab lus tawm kom cais cov DC voltage ntawm virtual hauv av thiab hauv av.
Feem ntau, qhov hluav taws xob muab los ntawm ib qho hluav taws xob ib leeg yog 5V, thiab cov zis hluav taws xob viav vias ntawm kev ua haujlwm amplifier yuav qis dua. Tsis tas li ntawd, tam sim no lub hwj chim mov voltage ntawm lub lag luam amplifier tuaj yeem yog 3V lossis qis dua. Vim li no, kev ua haujlwm amplifiers siv nyob rau hauv ib lub hwj chim mov circuits feem ntau yog Rail To Rail ua haujlwm amplifiers, uas tshem tawm qhov poob ntawm ntau yam dynamic. Nws yuav tsum raug sau tseg tias ob qho tib si tawm tswv yim thiab cov zis yuav tsis tuaj yeem tiv taus qhov voltage ntawm Rail To Rail. Txawm hais tias cov cuab yeej tau teev tseg raws li Rail rau Rail, yog tias cov zis lossis cov tswv yim ntawm kev ua haujlwm amplifier tsis txhawb Rail rau Rail, qhov hluav taws xob nce mus txog qhov kev tawm tswv yim lossis qhov hluav taws xob tso tawm hluav taws xob tuaj yeem ua rau lub luag haujlwm ntawm kev ua haujlwm amplifier. Yog li ntawd, nws yuav tsum tau ua tib zoo xa mus rau cov ntaub ntawv phau ntawv los xyuas kom meej tias ob qho tib si tawm tswv yim thiab cov zis yog Rail rau Rail. Qhov no yog tus tsim lub luag haujlwm los xyuas kom meej tias qhov kev ua haujlwm ntawm lub system tsis degrade.
